DOI:https://doi.org/10.1103/PhysRevLett.6.589
©1961 American Physical Society
C. F. Barnett, J. L. Dunlap, R. S. Edwards, G. R. Haste, H. Postma, J. A. Ray, R. G. Reinhardt, W. J. Schill, R. M. Warner, and E. R. Wells*
Vol. 6, Iss. 11 — 1 June 1961
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